Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Sordariomycetes O.E. Erikss. & Winka (1997) Subclass Sordariomycetidae O.E. Erikss. & Winka (1997) Order Phyllachorales M.E.Barr (1983) Family Phyllachoraceae Theiss. & H. Syd. (1915) Genus Retroa P.F. Cannon (1991)